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Fair Value of Financial Instruments - Summary of Composition of Short and Long Term Investments (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 492,537	$ 448,492
Unrealized Gains	59	8
Unrealized Losses	(385)	(443)
Aggregate Fair Value	492,211	448,057
Commercial Paper [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	8,256	5,874
Unrealized Losses	(14)	(7)
Aggregate Fair Value	8,242	5,867
Corporate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	70,958	81,947
Unrealized Gains	3
Unrealized Losses	(233)	(279)
Aggregate Fair Value	70,728	81,668
US Government Agency Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		4,000
Unrealized Losses		(13)
Aggregate Fair Value		3,987
US Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	413,323	356,671
Unrealized Gains	56	8
Unrealized Losses	(138)	(144)
Aggregate Fair Value	$ 413,241	$ 356,535

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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